Gas conversion burner



April E. A. NORMAN, JR 2,467,625

GAS CONVERSIO BURNER Filed April 1, 1946 Enventor Cittorneg Patented A r. ie, 1949 GAS CONVERSION BURNER Edward A. Norman, Jr., Columbus, Ohio, assignor to Surface Combustion Corporation, Toledo, Ohio, a corporation of Ohio' Application April 1, 1946, Serial N0. 658,815 2 Claims. (01. 158-7) The present invention relates to a gas conversion burner for ordinary house heating furnaces originally designed for burning solid fuel and has for its general object to provide an assembly which shall be unique from the standpoint of its relative simplicity and low .cost of manufacture.

For a consideration of what I believe to be novel and my invention, attention is directed to the following specification and the claims appended thereto.

In the drawings,

Fig. 1 shows how the improved burner may be applied to an ordinary house heating furnace to fire upwardly, it being understood that only the lower portion of the furnace below the usual fire door is shown.

Fig. 2 shows how, by a slight modification, the burner may be applied to a somewhat different type of ordinary house heating'furnace to'fire horizontally, it being understood that only the lower portion of the furnace below the usual fire door is shown.

Fig. 3 is an isometric view of the improved burner with a cover removed to expose certain parts of the assembly.

Fig. 4 is an isometric view of a cover for certain parts of the burner assembly.

Fig.' 5 illustrates details of the mixing tube assembly.

Fig. 6 is an enlarged sectional view of the burner head at the discharge end of the mixing tube.

Fig. 7 is a side elevation of the burner shown in Fig. 1 with parts omitted and other parts in section.

Figs. 8 and 9 are cross sectional views of details involving the mixing tube.

The burner assembly is adapted to be mounted in the doorway of the ash pit chamber lb of an ordinary househeating furnace ll originally designed for burning solid fuel; and the assembly comprises a mixing tube i2 which delivers to a burner head l4 positioned in the furnace annular well 25 around the port by way of a circular row of bleed ports 26 whereby to produce about the fuel issuing from the burner port IS an annular piloting flame which cannot readily be blown out. The projecting end of the mixing tube is supported by means comprising a stand 22 for a threaded rod 2! which extends into a boss 23 on the mixing tube.

The burner assembly comprises-a platform 21 having an arch adapted to be positioned in the doorway of the ash pit chamber to position the platform in front thereof. A flange 3i on the arch limits inward positioning of the arch. Two pedestals 32 and 33, front and rear, are mounted on the said platform 21 for supporting the said mixing tube l2 some distance above the platform. To permit the burner head l4 tobe located at the vertical axis of different size furnaces, the mixing tube is horizontally extensible by being comprised of telescoped parts 34 and 35 of which the. front part 34 is fixedly secured to the front pedestal 32 as by a clamping strap 3t whereas the rear part 35 is adjustably secured to the rear pedestal 33 as by a set screw 3'! in 25 an overhanging portion of the pedestal.

Fuel gas is discharged into the mouth of the mixing tube by a jet orifice nozzle which extends from the front face of a hollow head M mounted on the platform 21. The amount of primary air entrained by the gas jet is controlled not by an air shutter but by varying the distance between the gas nozzle and the mouth of the tube, the front end of the mixing tube being comprised of a telescoped portion 52' for that purpose, the said portion being held in adjusted position by a thumbscrew 43 carried by the clamping strap 36 which holds the intermediate portion 34 of the mixing tube in fixed position.

The head, M is in efiect the upturned end of a horizontally disposed gas conduit 44 which terminates beyond the lateral side of the platform 21. Parallel to the conduit 44 is a gas conduit 45 which extends through alined apertures in upstanding stiffening flanges at the lateral sides of the platform 21. The adjacent ends of the conduits 44 and 46 are interconnected by a valve body 45 of the return bend type, the connecting means 18 being of the flange and bolt type whereby to permit the valve body to be readily removed in the field for repairs and the like to the valve and to the valve operating mechanism 49 associated therewith as will be readily under-- stood. At its other end the pipe 46 is connected to a pressure regulator 41 to which the main gas supply pipe 38 delivers.

As is customary with gas conversion burners, the operation of the valve operating means 48 is controlled by a safety pilot generally indicated at 5| to the extent that if the pilot becomes extinguished the gas valve cannot be opened until the pilot has been relighted. The control connections between the pilot controlled thermostat and the valve operating means 49 have been omitted in the interest of simplified showing; however, reference numeral 52 may be considered as indicating a box for housing terminal connections relating thereto.

The means for installing the safety pilot 5| adjacent the burner head ll comprises a rail 55 normally disposed alongside the mixing tube l2. The upper end of the rail has a top notch 6| wherein the base 50 of said pilot is normally seated, the said base having a rail-straddling slot 60 so it can be guided along the rail to its seat 6|. The upper end of the rail has a downturned finger 58 for entry into a socket 51 carried by the tubular portion l6 of which the burner head 14 is comprised and the lower end of the rail has a downturned finger 59 for entry into an elongated socket 66 carried by the mixing tube portion 35. To install the safety pilot, it will ordinarily first be passed by hand through the platform arch 30 and then positioned on the rail just inside of the arch whereupon it can be pushed along the rail to its seat 61 as by its gas feed pipe 53 which will not yet have been connected to its pressure regulator 54. In case the safety pilot requires subsequent attention it may be readily removed by lifting the rail from its sockets and then by proper manipulation removing the parts through the platform arch as will now be readily understood.

The fuel issuing from the burner port l5 requires secondary air for proper combustion. The air for this purpose enters the furnace through the platform arch 30 which for this purpose is an air duct. However, uncontrolled admission of such air is not desirable and it is a feature of the present invention that there is provided a hood-type cover 62 which cooperates with the platform arch 30 to form above the platform 21 an enclosure whereinto the inflow of atmospheric air is controlled by a dampered inlet 63 in a side wall of said cover. The cover is readily removable to permit access to the parts on the platform. The damper for said air inlet comprises louvers 65 adapted to be opened and closed by means comprising a lever 66 actuated by the valve operating mechanism 19.

In some type of furnaces, it is not desirable to fire upwardly as in Fig. 1 but rather horizontally as in Fig. 2. The present burner assembly can be readily adapted for horizontal firing by using a straight mixing tube instead of an angled one as will be readily understood by reference to Fig. 2.

4 The flame from the burner head is deflected upwardly by an upwardly curving baffle 61.

From the foregoing description it will be readily appreciated that the present invention provides a burner assembly which is well adapted for its intended purposes and which is well adapted for low cost manufacture.

What I claim as new is:

1. In a burner assembly for a furnace having in its side an opening wherethrough access is had to the furnace chamber, the combination which comprises a parts-supporting platform adapted to be positioned in front of the furnace opening, a mixing tube mounted on the platform to extend through said opening for supplying combustible mixture to a burner adapted to burn the mixture in the furnace chamber, a gas nozzle mounted to discharge into the mouth of the mixing tube, means comprising a. gas valve body at one lateral side of the platform for controlling the delivery of gas to said nozzle, means for conducting gas to said valve body comprising a conduit which extends across and is mounted on the platform below the mixing tube with its discharge end in gas connection with the inlet end of said valve body, and means for conducting the gas from said valve body to said gas nozzle comprising a conduit which extends crosswise of and is supported on the platform with its inlet end in gas connection with the outlet end of said valve body.

2. A burner assembly according to claim 1 comprising an arch carried by the furnace end of the platform for insertion in the furnace opening to hold the platform in position with respect thereto, and a hood forming a removable cover over the parts on the platform in front of said arch with the front end of the hood in open communication with the furnace chamber through said arch, and with the said valve body outside of said hood.

EDWARD A. NORMAN, JR.

REFERENCES CITED The following references are of record in the Ames Oct. 6, 1942 

